Malicious PDF — malware analysis report

Static analysis result for SHA-256 99491a0d19b2f22a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-26 00:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83021142e118891000258c6f6a5ee533 SHA-1: 004c3189eea6d2632a5a1b8331f107ae62009a82 SHA-256: 99491a0d19b2f22afb954d1d645c76765187deb4d42e5b0b1706f5f24718252f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a tactic to lure users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of external links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=lucifer+season+4+online+free PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a39ff33972894bb66a49b6285925056e/jamax.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/74700430055.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/labisesinajikiruzegonup.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/59237833719.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/levusunefuwoxedivavimove.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109140442028469.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/selikubawemegoduris.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/bomezulomonepobebavujito.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/mipagevifilepulirebaxi.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/6384064749.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/35a96ffd1e895ea02faa54c78603477f/15028672703.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631841110433137326.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/jeforeliw.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/32911530113.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/gowuzawulefazo.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/jexidukomemuloroj.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/morad.pdfIn PDF document text
    • http://serting.eu/userfiles/files/todavekirikadukib.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210909_161814.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/zexufofiduwetoxa.pdfIn PDF document text
    • http://nanopena.cz/upload/file/50356680618.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/87858553573.pdfIn PDF document text
    • https://gmt.twwebmarket.com/ckfinder/userfiles/files/74263884727.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/90343237851.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/noruxafiwo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614297d0b4951---madomanonovekixom.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000befa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFA 10364 bytes
SHA-256: dd6a00d7114543271cba4b8af2939335508d8dec31026d74df34334611d538ae
font_01_sfnt_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 17884 bytes
SHA-256: bc66eebcc77f703873da9d58ba000b38d33c55403b743937615491430f208e74
font_02_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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